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No , it's not the park neutral switch , The park neutarl switch won't allow the vehicle to start if not in park or neutal , has nothing to do with turning off the vehicle . Problem with the shift lock contro system probably !
Park Lock Control System (Regal)
The park lock control system is a safety device that prevents an inadvertent shift out of PARK when the ignition is OFF. The system consists of the following components:
• The automatic transmission park lock solenoid
• The brake to shift relay
• The body control module (BCM)
• The powertrain control module (PCM)
With the ignition in the OFF position the park lock control solenoid is de-energized. This mechanically locks the shift lever in the PARK position. With the ignition in the ON position, battery voltage is supply to the park lock control solenoid. The control circuit of the park lock solenoid is provided a ground through the brake to shift relay when energized. The body control module (BCM) supplies a ground for the brake to shift relay when the body control module (BCM) receives a class 2 message from the powertrain control module (PCM) indicating the transmission is in the PARK position. This closes the normally open contacts of the brake to shift relay and grounds the park lock control solenoid. This energizes the park lock control solenoid releasing the mechanical park lock.

Sorry , but your best bet would be to take your vehicle to a qualified repair shop .

If your vehicle is equipped with one,you've most likely got a defective brake/stop light switch.It will cause the brake lights to stay on continuously,not come on at all or prevent the shifter from moving out of park.If this switch is bad,it can cause just one of the symptoms above to occur or all of the symptoms above.So in otherwords,the brake lights can still be working just fine,but it can still cause the "shifter is stuck in park" issue you're having.However if your brake lights aren't working correctly,that's definitely a sign the switch is bad.

Hi Judy , what kind of vehicle do you have ? Year an model ? ABS light has nothing to do with it not coming out of park . Problem with
automatic transmission shift lock control ! Probably !
The automatic transmission shift lock control is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
?€¢
The automatic transmission shift lock control solenoid.

?€¢
The automatic transmission shift lock control switch.

?€¢
The park/neutral safety switch.

With the ignition in the ON position, battery positive voltage is supplied to the automatic transmission shift lock control switch. The circuit continues through the normally-closed switch to the automatic transmission shift lock control solenoid. The park/neutral safety switch provides a path to ground for the automatic transmission shift lock control solenoid in the PARK position. This energizes the automatic transmission shift lock control solenoid, mechanically locking the shift linkage in the PARK position. When the driver presses the brake pedal the contacts in the automatic transmission shift lock control switch open, causing the automatic transmission shift lock control solenoid to de-energize. This allows the shift lever to move from the PARK position. When the shift lever is out of the PARK position the contacts in the neutral safety switch open and the automatic transmission shift lock control solenoid is de-energized.

The 2000 Mercedes models all utilize a Shift Interlock, which will only allow the vehicle to be shifted out of Park while the brake is applied. The way this works is that a lock pin holds the shift lever in the Park position until a solenoid is powered by the brake light circuit, pulling the lock pin away from the shift linkage. The wire to the solenoid may come loose, or the brake light switch may fail. If someone tried to remove the vehicle from Park without applying the brake, the end of the lock pin may have become jammed. Try two things: 1) Start the vehicle, put your foot on the brake, and attempt to move the shift lever from Park to Reverse. 2) If you cannot remove the vehicle from Park, are the brake lights coming on? If not, a) replace the 15A fuse for the brake light circuit, and b) try Step 1 again. 3) If you cannot remove the vehicle from Park and the brake lights are coming on normally, locate the interlock solenoid at the shift lever and make sure it is properly connected. When you put your foot on the brake, the solenoid should retract. If it does not, check for 12V at the solenoid when you put your foot on the brake. If you have voltage, replace the solenoid. If you do not have voltage, you have a broken wire between the brake light switch and the solenoid. If the solenoid retracts but you still cannot remove the vehicle from Park, your shift linkage may have become bent at the transmission linkage. Hope that's helpful! :)

I believe this vehicle is equipped with a shift lock that necessitates depressing the brake pedal before it can be shifted out of "Park". This is a safety feature designed into almost every car made nowadays to prevent unintended movement of the vehicle when shifting out of "Park". The Shift Lock solenoid is triggered by the brake light switch located near the top of the brake pedal arm. Starting with the "basics", check to see if the brake lights are working (they should illuminate when the brake pedal is pressed. If the brakes lights do not come on. then proceed to check the brake/stop light fuse. Replace if needed. Once the brake lights are functioning, the shift lock should "disengage" and allow you to shift out of "Park" when the brake pedal is pressed. If the fuses are okay, but still no brake lights, then the Brake Light Switch may need to be replaced.

Brake lights working but won't shift out of "Park"? Check for a separate fuse for the Shift Lock Solenoid. Replace if needed. Otherwise the Shift Lock Solenoid may need to be replaced. This will require disassembly of the console to access the part.

My 2006 Uplander would not shut off the parking lights. I came here for a solution. I saw the answer here, actually the question, and I used the key fob to lock the vehicle. The lights went off. That was a temporary solve. Now, is this a "glitch" or a "feature"?

The park lights staying on indicates the switch is deteriorating.
I would replace it.
The door locks is probably a voltage issue. With the cold weather, the locks need more voltage to unlock. They get that voltage when the engine is running. If you really want the locks to work without the engine, you might try accessing the locks and cleaning them. Then use a lightweight grease, like lithium grease, to help them open with less power.

The park is locked out until the brake is pushed, make sure the brake lights work, if not test the brake light switch with a test light, if all that is ok then the solenoid that disengages the park lock out is defective.